Yes I would like to learn bike maintenance but I'm not sure who runs classes here, if anyone. I know there are classes for motorbike maintenance at our local college but I've never seen any for bicycle maintenance.
Just ask your bike shop(s)! They might know. They might also be happy to take you in the shop and simply let you watch as they explain to you what they're doing, or even walk you through doing it yourself. It's not rocket science.
I'm going to have a cycle up to the large bookstore on Tuesday after work and see if I can find a book that gives step-by-step instructions on bike maintenance.
There are a lot of unwanted, unloved bikes out there - go on give a bike a good home